"Clear Sky Complete is a part of Complete mod collection, a series of modifications, created by professional artists, dedicated to enhancing S.T.A.L.K.E.R. games in matters of graphics, sound, bug fixes, and atmosphere," writes compiler artistpavel.
nope The mod is compatible with Clear Sky version 1.5.10 and will work with retail boxed copies as well as digital download copies from Steam or Direct2Drive.
While there is no complete list of enhancements yet, the mod is based upon artistpavel's previous "Complete Mod" for the original S.T.A.L.K.E.R.: Shadow of Chernobyl, which contained "new textures, sounds, music, sky, weather system and visual effects, along with bug fixes, AI improvements, upgraded graphics, ragdoll physics, a revamped user interface and oh so much more."